Bog, Manuela and Baessler, Claus and Oberprieler, Christoph (2017) Lost in the hybridisation vortex: high-elevation Senecio hercynicus (Compositae, Senecioneae) is genetically swamped by its congener S-ovatus in the Bavarian Forest National Park (SE Germany). EVOLUTIONARY ECOLOGY, 31 (4). pp. 401-420. ISSN 0269-7653, 1573-8477
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Hybridisation is an important evolutionary process. The investigation of hybridisation along elevational gradients, with their steep abiotic and biotic clines, provides insight into the adaptation and maintenance of species in adjacent habitats. The rare Senecio hercynicus and its spreading congener S. ovatus are vertically vicariant species that show hybridisation in their range overlaps. In the present study, we used AFLP fingerprinting of 689 individuals from 38 populations to analyse population structure and introgression patterns along four elevational transects (650-1350 m) in the Bavarian Forest National Park, Gemany. Subsequently, we searched for loci putatively under divergent selection that may maintain 'pure' species despite hybrid formation by identifying taxon-specific alleles. A maximum-likelihood based hybrid index shows that the overall genetic differentiation among all populations was very low with a vanishingly small number of pure parental individuals. Almost 75% of the investigated individuals were classified as backcrosses towards S. ovatus. The highest S. hercynicus ancestry was found in the uppermost populations of two transects. Further, we found seven taxon-specific alleles being under divergent selection that correlated with climatic variables and deviating from neutral introgression. According to our results, hybridisation of S. ovatus and S. hercynicus has reached an advanced state of genetic swamping and there seems to be no driving force that is strong enough to keep both species as different lineages. Rather, S. ovatus appears to benefit through putatively adaptive introgression.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | INTROGRESSIVE HYBRID SWARM; MULTILOCUS GENOTYPE DATA; POPULATION-STRUCTURE; GENOME SCAN; DOMINANT MARKERS; CANDIDATE LOCI; ARABIS-ALPINA; MOUNT-ETNA; SELECTION; SPECIATION; Amplified fragment length polymorphism (AFLP); Adaptive introgression; Hybridisation; Natural selection; Population genomics; Senecio nemorensis syngameon |
| Subjects: | 500 Science > 580 Botanical sciences |
| Divisions: | Biology, Preclinical Medicine > Institut für Pflanzenwissenschaften > Group Plant Systematics and Evolution (Prof. Dr. Christoph Oberprieler) |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 14 Dec 2018 13:16 |
| Last Modified: | 18 Feb 2019 15:00 |
| URI: | https://pred.uni-regensburg.de/id/eprint/1472 |
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